#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
    int m = 0;
    scanf("%d", &m);
    int sum = 2 * (m - 1 + (m - 1) * (m - 2) / 2);
    printf("%d", sum + 1);
    for (int i = 1; i < m; i++)
    {
        printf("+%d", sum + 1 + 2 * i);
    }
    return 0;
}